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i need this question answered ASAP to check my work! Thank you:) One one plece of paper - Put your name in the upper right
i need this question answered ASAP to check my work! Thank you:) 
One one plece of paper - Put your name in the upper right hand comer - Put your answer to 1 on the top half of the paper - Put your answer to 2 on the bottom half of the paper 1. A new element "Reese", symbol R, with 3 isotopes has been discovered with an atomic mass of 128.75. It consists of 15%125R 55%128R 30.%nR What is the third isotope? Show your algebra Step by Step Solution
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Fundamentals Of General Organic And Biological Chemistry
Authors: John McMurry, David Ballantine, Carl Hoeger, Virginia Peterson
8th Edition
134015185, 978-0134015187
